604-00050 Parallax Inc, 604-00050 Datasheet - Page 15

• Manufacturer Part Number: 604-00050
• Description: IC FLOATING-PT COPROC V3 18-DIP
• Manufacturer: Parallax Inc

Specifications of 604-00050

• Processor Type: Floating-Point Co-Processor
• Voltage: 2.7V ~ 5.5V
• Mounting Type: Through Hole
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Speed: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Clock – select clock source
The Clock command allows you to change the clock source. The default clock speed is 29.48 MHz using an internal
oscillator which provides the maximum execution speed. The clock speed would only need to be changed for special
circumstances such as low-power applications. The clock source is stored in Flash memory as part of the device
configuration bits. The clock selection indicates the clock source to use at power-up. If the selected clock source
can’t be validated at power-up, the uM-FPU V3.1 chip will fall back to an internal clock speed of 1.8425 MHz. The
available clock speeds and clock sources are selected by entering one of the following values:
The following example changes the clock selection from 29.48 MHz to 14.74 MHz.
Note: It may be necessary to power the chip off and back on before the new clock source will take effect since some
clock sources use an internal PLL that only resets at power up. You can check the clock speed that the chip is
currently running at by using the Version command.
Checksum – display checksum value
The Checksum command displays a checksum for the uM-FPU V3.1 program code and user-defined functions
stored in Flash. This can be used to check that the chip is valid, or that a particular set of user-defined functions is
installed.
Micromega Corporation
Value
20
E1
EA
E3
E5
E6
E7
>$C
E3
:EA
>$S:001AB76A
Clock Speed
1.8425 MHz
7.37 MHz
14.74 MHz
29.48 MHz
10.0 MHz
20.0 MHz
29.4912 MHz
Clock Source
internal oscillator
internal oscillator
internal oscillator
internal oscillator (default clock speed)
external 10.0 MHz crystal
external 10.0 MHz crystal
external 7.3728 MHz crystal
15
uM-FPU V3.1 Datasheet
Debug Monitor